Monsters: Evolving from Titans to Ancient Gods.

This was the era before myths were recorded. Titans roamed the land, monsters wreaked havoc, and alien races from beyond the heavens were eyeing the land covetously. Humanity was merely an observer of this era.
Longbo awakens in a primitive tribe during the Neolithic Age, possessing the body of a Titan, and descends upon the beginning of mythology.
In Eastern mythology, He is Kuafu, who chased the sun and drank from the river, and Longbo, the giant who carried mountains on his back.
In Greek mythology, He is Tartarus, the lord of the abyss, who imprisoned the rebellious Titans.
In Norse mythology, He is the one-eyed Odin, who rides the eight-legged Pegasus and measures the edge of the world with the spear of eternity.
The deadly radiation caused Him to evolve, and with each powerful enemy He defeated, His power grew stronger.
When humanity began to use mythology as a compass to search for the traces of the gods.
Ultimately, it was discovered that the templates for all legendary giants were reflections of Longbo in the mirrors of legends from different civilizations.
...
Longbo wakes up to find himself reborn in the Neolithic Age, becoming a Titan born from early humans.
Just as he was preparing to conquer the world with his mission panel and become the King of Monsters, things started to go wrong...
What exactly constitutes a futuristic technological marvel and a golden monster on the banks of the Yellow River?
[Is it reasonable that Titan Wendigo was possessed and transformed into Ithacuya?]
[Titan Yamata no Orochi is brutally beaten; nine sacred dragon heads sway behind the culprit?]
[Does the pyramid at the center of the earth contain statues of giants and giant dogs? And who dumped corpses here?]
[How come this extraterrestrial dragon looks like a longhorn beetle?!]